Family name Niyomthiensin (Niyomthiensin 
) , throughout the world, is an extremely rare last name. The cognomen Niyomthiensin is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Also, Niyomthiensin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niyomthiensin | Thailand |
Tanattha, and Pacharathorn